Camera-shutter



(No Model.)

E. N. BLISS & J. P. MIDDLETON.

CAMERA SHUTTBR.

Patented July 24, 1888.

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UNITED STATES PATENT @Errea EDVARD N BLISS AND JAMES F. MIDDLETON, F NE'WARK, NEV JERSEY.

CAMERA-SHUTTLER SPECIFICATION forming part of Letters Patent No. 386,449, dated 24, 1888.

Serial No. 242,757. (No model.)

To @ZZ whom it may concern.:

Be it known that we, EDWARD N. BLISS and JAMES F. MrnnLEroN, citizens of the United States, residing in Newark, in the county of Essex and State of New lersey, have invented certain new and useful impro velnents in Camera-Shutters; and we do hereby declare that the following is a full, clear, and exact description of our invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Ourinvention has reference te camera-shutters for photographie purposes. it is designed for use in the instantaneous process77 of photography; and its object is to provide a slmtter which may be conveniently adjusted to make any desired length of exposure. llo this end we construct ourshutter of a pair of disks mounted on a common shaft and provided 2o with semicircular registering slots or openings, the disks being` rotative] y adjustable on the shaft with relation to each other7 so as to alter the length of the opening.

Referring to the accompanying drawings, Figures l and 2 represent face views ofthe two disks, Fig. 8, a face view of the disks placed together, illustrating an adjustment of the opening, Fig. 4, the disks geared to an electro-magnetic motor. The parts in this ligure 3o are only conventionally arranged to show one mechanism for rotating the shutter, and Fig. 5 is a sectional view of the disks and devices for connecting and adjusting them.

eferring to the drawings by letter, A and A represent the two disks. They arc ofequal size and provided with slots c a', which are also of equal size and form semi-circles around the centers of the disks. Disk A also has a series of perforations arranged on a circle around the center, and disk A a single perforation arranged to register with any of the perforations in A.

Both disks are mounted on a tube or shaft, Y), the disk A being rigidly secured thereto and A being mounted loosely..v A hanged sleeve, b', is slipped loosely over the shalt, a coiled spring, b2, also slipped over the sleeve, and both are held in place by a retaining-nut, c, which is cut away internally to allow the sleeve to slide into it against the pressure of the spring.

The liange ef the sleeve b carries an inwardly-projeeting pi 11,22, which is adapted to pass into the hole in. disk A', and any one of the holes of disk A, to lock the disks together. Thumb-pieces or cars c' are attached 55 to the danged sleeve to enable the operator to draw the sleeve and its pin back to unlock the disks. The loose disk may then be rotated the proper degree to present the length of opening desired, and the sleeve is allowed to 6o move back, so that the pin enters the registering-holes and locks the disks together as one piece.

The tubo or shaft b maybe connected or geared to any suitable motor-shaft. As an illustration, I have shown it connected with the shaft of an electric motor. In this motor the armature x is vibrated at will, which causes a rotation of the shutter.

The shutter is to be located in front of the 7e camera-opening, as shown in Fig. 3, in which the opening is represented by in. lt will be seen by this figure that a rotation of the shutter will cause an exposure ofthe opening during the time the open slot is presented. rEhe more nearly the slots a a coincide the longer will be the exposure. By different adjustments the length of exposure may he varied from this maximum to a very slight exposure when the slots register only through a minute por- 8o tion el" their extent. The variation can be effected by an operator with great ease.

This apparatus is susceptible of a double adjustment-one by altering the length of the slot and one by varying the speed of the motor. in the present instance the latter adjustment can be effected by increasing or decreasing the strength of the battery by which the eleetroinotor is operated.

XV hat we claim is- 9o l. A photograpine-camera shutter consisting of two rotary disks having a common axis and provided with corresponding openings, one disk being iixed to the axis and the other being adjustable thereon.

2. A photographic-camera shutter consisting of two disks having a common axis and provided with openings or slots of the same dimensions and shape, one disk being xed to the axis and the other being adjustable thereon. roo

3. A photographic-camera shutter consisting of two disks, one of which is rigidly mounted on the shaft and the other loosely mounted thereon, the said disks being provided With openings which may be adj usted to register with each other, in combination with mechanism,snbstantially as deseribed,for adjusting the said disks and devices for looking them together as one piece.

4.' A photographie-camera shutter consisting of two disks, one of which is rigidly mounted on a shaft and the other loosely mounted thereon, the said disks being provided With openings which may be adjusted to register with each other, in combination with mechanism, substantially as described, for adjusting the said disks to make thelength of exposure required.

5. A camera-shutter consisting of a pair of disks having a common axis, one of the said disks being rigidly secured to the shaft and the other disk loosely mounted thereon, the

EDWARD N. BLTSS. JAMES F. MIDDLETON.

Witnesses:

G. H. STOCKBRIDGE, AUGUsTUs MERRITT. 

